And john k



BOILER F. w. BAKER ET AL Filed Aug. 24, 1926.

- Frederic WBQfi'er John H. DWeE QA Patented ring. 24-,

i l it RC FREDERIC W. EAKEBQ OF CLAYI'JIONT, DELAWARE, AND JOHN R; ONEILL, OF 'BALA,

" PENNSYLVANIA. z i

BOILER.

Application filed June as. 1925. Serial No. 40,388.

This invention relates toboilers, and an object ofthe invention is to provide a boiler structure including a fire-box composed of a plurality of water. legswhich are bowed or curved to present concave. surfaces towards each other for the purpose of. providing stayless water legs which maybe thoroughly cleaned, and which have a sustained capacity. i

A further object of the invention is to pro videa return tube boiler inwhich the drum is placed as a unit upon a unit fire-box structure, and one in which the drum shell is extended rearwardly beyond the back tube sheet to form the rear smoke box and top of the combustion chamber.

Another object of the invention is to provide in a. boiler structure, a firebox of four separate chambers, each of which contains water and which are connected with the drum, at the top ofthe various water legs or chambers, and the bottom of the drum,

at the bottom of the various chambers, thereby permitting the preheat-ingof the water prior to its entrance into the drum.

Other objects of the invention will appear in the following detail description, and in the accompanying drawings wherein:

Figure 1 is a longitudinal section though the boiler.

Figure 2 is a cross section through the boiler.

Referring; more particularly to the. drawinns, 1 indicates the drum of a return tube boiler of approved type, which has a front tubeplate 2, rear tube plate and body shell a. It will be noted by particular reference to Figure 1 of the drawings, that the upper portion 5 of the body shell is extended rearwardly beyond the rear tube plate 3 forming the rear smoke-box and top of the combustion chamber and that the tubes 1 all of equal length. The drum 1 has a plurality of angle irons 6 riveted or welded thereto, whichangle irons are in turn bolted orsuitably attached to the upper edges of the walls of the fire-box structure 7 and adapted to receive lagging to prevent escape of smoke or products of combustion. It should be understood that the weight of the body t is primarily supported at the front and rear portions of the fire box structure.

The fire-box structure 7 of the boiler com prises the side walls 8 and 9 respectively,

each of which is composed of plates 10 11. The plates 10 and 11 are rolled to form a circular arc and are positioned with their concave surfaces facing. as clearly shown in Figure2 of the'drawings, to provide sufficient strength without requiring the use of stay bolts, such as ordinarily used with flat plates, and also providing chamber within the plates lOand 11 for containing water which is pie-heated and which, passes from. the upper'edges of the sides 8 and 9 through curved pipes 12 into the drum. Thepipes 12 communicate with the. water legsor sides 8 and 9 at their highest points, and extend .into the drum curving along'theinner side of the drum to permit the introduction of the water into the drum at its lowest point.

The front 14tof the fire-box structure is made up of spaced fiat plates 15 and 16, which are spaced by suitable distance pieces and stays 17 and provide a water chamber 18. The upper edge of the front is concavely curved for fittingthe outer surface of the body shell of the drum, and its side edges are concavely curved for properly -fitting the inner surfaces of the sides8 and 9.

The rear side 19 of the fire-box is composed of spaced plates 20 and 21 which may be spaced by suitable distance pieces and stays 22. The fire box door front is indicated by the reference numeral. 22. The plates 20 and 21 like the plates 15 and 16, of the front, are spaced to provide a chamber, as indicated by the reference numeral 24, for containing water and these chambers 18 and 24 have outlet communication with the drum through suitablepipes one of which is indicated at 25" and shown in Figure 1 the uppermost part of the chamber 2st. The chambers 18 and 24 and the chambers within the plates 10 and 11 have inlet connections" at their lowermost points through suitable pipes 25. A drain pipe 26 is provided and communicates with the lowermost portion of the drum and has branch pipes 26 which communicate with the lowermost portion of the water chambers in the walls of the tire box and this drain pipe may be provided with a suitable valve as indicated by the llll From the foregoing description, taken in connection with the accompanying drawings, it will be apparent that a boiler structure has been provided wherein-theproducts of combustion will be guided rearwardly nto the combustion chamber, and upwardly therefrom through the drum, and that the heating qualities of the products of combustion will be utilized twice for thelieatingof the'water, first by heating the Water in the water legs and'sejc'ond, by heating the watern th'edrum, as" the products of combustion pass through tliet'ube's thereof? "The top of the shqwniii Figure 1 and then throu gh the upproducts bein g' indicated' by the arrow in iguife I It i; urse',to be understood, that the iny'entioh'maybe constructed in arious other manners and the parts associated in different relations, and therefore, we do not desire to be limited in any manner, except as set forth in the claims'hereunto appended.

What we claim is 1. In a fire box structure for a boiler, a

Wall comprising two outwardly curved, op-

positely disposed plates cooperating to provide a water chamber.

In a boiler comprisingua drum and a fire-box, outwardly curvedplates cooperatively associated to providecl ainbers'forming the side Walls of the fire box; and pipes having communication with the" highest point of the chambers and'the lowest point in the drum. V

3. In" a boiler compr s ng a drum and a fire box,outwardly curved plates cooperatively associated to'provi'de chambers forming the'side walls of the fire box, and means of con'iniu'nica'tion between the chambers and the drum;

a In testimony whereofwe aflixour'signzitures. 7

FREDERIC W. BAKER. JOHN R: ONEILL'. 

